Multipeer Connectivity: Invalid Service Type

Question

I try to use the Multipeer Connectivity framework, but I get a failure when trying to instantiate MCNeaarbyServiceBrowser using serviceType.

Below is the code:

private func setUpSession() { self.session = MCSession(peer: self.peerId); self.session!.delegate = self; self.browser = MCNearbyServiceBrowser(peer: self.peerId, serviceType: "stc-classroom-vik"); self.browser!.delegate = self; self.advertiser = MCNearbyServiceAdvertiser(peer: self.peerId, discoveryInfo: nil, serviceType: "stc-classroom-vik"); self.advertiser!.delegate = self; } 

and this is the error / error I get:

 2014-08-15 12:24:42.689 Xavier[614:254319] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid serviceType passed to MCNearbyServiceBrowser' 

I would really appreciate any help.

Answer 1

I believe that you are allowed to have only one hyphen in your serviceType parameter serviceType , and that should be 15 characters or less. You have two hyphens and 17 characters.

From the comments for MCNearbyServiceBrowser() :

The serviceType parameter is a short text string used to describe the network protocol of the application. It must be in the same format as the Bonjour Service Type: up to 15 characters and valid characters include ASCII lowercase letters, numbers, and hyphens. Short name that differs from unrelated services; for For example, a text chat application made by ABC may use the service type “A-txtchat”.

Answer 2

The length of your type of service is more than 15 characters and contains 2 hyphens.

I suggest you write a small function to check the serviceType string format for security.

Answer 3

The above answers are true in that the Bonjour service type can only contain 15 characters.

However, there is no “one hyphen” limit. The wording of the Bonjour specification is to describe the characters allowed in serviceType.

"stc-class-vik" is a valid type of serviceType